Model reduction strategy applied to a problem of crack propagation in anisotropic materials

Walid Tezeghdanti (1) , Yoann Guilhem (1) , Sylvie Pommier (1)

1 LMT - Laboratoire de Mécanique et Technologie

In order to predict the life of high pressure turbine blades, a damage tolerance approach must be set. This approach requires a study of crack propagation. Besides, these components can be made as single crystals which creates a challenge in studying crack propagation in anisotropic materials. Instead of running expensive elastic-plastic computations, an elastic analysis is applied over the whole structure while a confined elastic-plastic one, fed by the previous, is processed on the K-dominance zone around the crack tip. Kinematic displacement fields from these analyses are projected on a reduced basis in order to obtain a non-local condensed model that serves as an input for an incremental model. This condensed model gives a variation of blunting intensity factors of different modes as a function of the loading given through stress intensity factors.

Domaines: Mécanique des matériaux [physics.class-ph]; Matériaux et structures en mécanique [physics.class-ph]

Walid Tezeghdanti, Yoann Guilhem, Sylvie Pommier. Model reduction strategy applied to a problem of crack propagation in anisotropic materials. 35ème Journées de Printemps, SF2M, May 2016, Paris, France. 2016. ⟨hal-01580036⟩